Method __setattr__

Solutions/6_3/structure.py:16–20

(self, name, value)

            setattr(self, name, val)

    def __setattr__(self, name, value):
        if name.startswith('_') or name in self._fields:
            super().__setattr__(name, value)
        else:
            raise AttributeError('No attribute %s' % name)

    def __repr__(self):
        return '%s(%s)' % (type(self).__name__,